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Thermoelectric properties of solution-combustion-processed Na(Co1?xNix)2O4

Author:
Park, K.   Choi, J. W.   Lee, G. W.   Kim, S. -J.   Lim, Y. -S.   Choi, S. -M.   Seo, W. -S.   Lim, S. M.  


Journal:
Metals and Materials International


Issue Date:
2012


Abstract(summary):

We synthesize nano-sized Na(Co1-xNix)(2)O-4 (0 a parts per thousand broken vertical bar x a parts per thousand broken vertical bar 0.12) powders by the solution combustion method using aspartic acid as combustion fuel. The influence of Ni2+ on the thermoelectric properties for the Na(Co1-xNix)(2)O-4 is investigated. When the Ni2+ content is increased, the electrical conductivity (sigma) is lowered mainly because of an increase in the porosity. In addition, the Ni2+ substitution leads to a significant increase in the Seebeck coefficient (alpha) up to x=0.06, and then a decrease with further increasing its content. The power factor (sigma alpha(2)) is thus improved by the Ni2+ substitution. We obtain the highest power factor (5.55x10(-4) Wm(-1)K(-2) at 800 A degrees C) for Na(Co0.94Ni0.06)(2)O-4. This value is over five times higher than that of NaCo2O4 (1.08x10(-4) Wm(-1)K(-2)) at 800 A degrees C.


Page:
1061-1065


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